A seemingly ordinary tunnel holds a secret about Los Angeles. This is the Airport Tunnel. Also known as the Sepulveda Boulevard Tunnel, it’s more than just a passage. It’s a historic landmark.
The Airport Tunnel carries Sepulveda Boulevard beneath the runways of Los Angeles International Airport LAX. Specifically, it runs under runways 25L and 25R. This makes it a crucial artery for both local traffic and airport operations. This section of Sepulveda Boulevard is part of California State Route 1.
Imagine the late 1940s. LAX, then called Mines Field, was expanding. Its runways needed to be longer. Sepulveda Boulevard stood directly in the path of this expansion. Initially, the road was rerouted. It went around the western end of the runways. But that wasn’t ideal. The Airport Tunnel allowed Sepulveda Boulevard to return to its original straight path. It was a groundbreaking solution.
Construction of the Airport Tunnel began in October 1949. It finished in March 1953. The project cost $3.5 million. That is equivalent to about $59 million today. Funding came from a 1945 bond issue and a federal grant.
The opening ceremony was quite the event. It took place on April 21, 1953. Mayor Fletcher Bowron officiated. The first 100 motorists received souvenirs. The Airport Tunnel was experimental. Nothing like it had been built before in the United States. It was the first tunnel to run under an airport runway in the country.
The Airport Tunnel featured complex engineering for its time. Two ventilation houses ensured fresh air. Each house had four fans. These fans pushed fresh air in and pulled exhaust fumes out. A power substation supplied energy to the vapor lights and fans. A drain system collected rainwater. The water then emptied into vaults. From there it was pumped out.
The road has six lanes. There are three lanes in each direction. Six turnouts provide space for broken-down vehicles. Each turnout can hold three cars. Motorists often complained about the poor lighting. The lighting system was overhauled in 1965. It was revamped again with LED lights in 2012. Exhaust soot builds up over time. The Airport Tunnel is closed periodically for cleaning.
One unusual incident occurred when a truck hauling a large boat got stuck in the Airport Tunnel. The vessel’s size proved too much for the tunnel’s clearance. Quick-thinking officers closed the affected lanes. They carefully maneuvered the boat in reverse. Eventually, they guided it back onto Imperial Highway. Commuters were both bewildered and amused. The Sepulveda Boulevard tunnel only has a clearance of 15 feet.
The Airport Tunnel is 1,909 feet long. That is 582 meters. It has a northbound tunnel clearance of about 15 feet. The southbound tunnel has a clearance of about 15.17 feet. The Airport Tunnel is 80 feet wide. The operating speed is 40 mph. That is 64 km/h.
The Airport Tunnel stands as a testament to innovation. It is a reminder of Los Angeles’s commitment to progress. Next time you drive through it remember its place in history. It is more than just a tunnel. It’s a vital part of LAX and the city itself.